package com.gupt.reggie.service.impl;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.stream.Collectors;

import javax.servlet.http.HttpSession;

import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.toolkit.IdWorker;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.gupt.reggie.common.CustomException;
import com.gupt.reggie.dto.OrdersDto;
import com.gupt.reggie.entity.*;
import com.gupt.reggie.mapper.OrderMapper;
import com.gupt.reggie.service.*;

import lombok.extern.slf4j.Slf4j;

@Service
@Slf4j
public class OrderServiceImpl extends ServiceImpl<OrderMapper, Orders> implements OrderService {

    @Autowired
    private ShoppingCartService shoppingCartService;

    @Autowired
    private UserService userService;

    @Autowired
    private AddressBookService addressBookService;

    @Autowired
    private OrderDetailService orderDetailService;

    /**
     * 用户下单
     * @param orders
     */
    @Override
    @Transactional
    public void submit(HttpSession session, Orders orders) {
        //获得当前用户id
        Long userId = (Long) session.getAttribute("user");

        //查询当前用户的购物车数据
        LambdaQueryWrapper<ShoppingCart> wrapper = new LambdaQueryWrapper<>();
        wrapper.eq(ShoppingCart::getUserId,userId);
        List<ShoppingCart> shoppingCarts = shoppingCartService.list(wrapper);

        if(shoppingCarts == null || shoppingCarts.size() == 0){
            throw new CustomException("购物车为空，不能下单");
        }

        //查询用户数据
        User user = userService.getById(userId);

        //查询地址数据
        Long addressBookId = orders.getAddressBookId();
        AddressBook addressBook = addressBookService.getById(addressBookId);
        if(addressBook == null){
            throw new CustomException("用户地址信息有误，不能下单");
        }

        long orderId = IdWorker.getId();//利用idwork生成订单号

        AtomicInteger amount = new AtomicInteger(0);

        List<OrderDetail> orderDetails = shoppingCarts.stream().map((item) -> {
            OrderDetail orderDetail = new OrderDetail();
            orderDetail.setOrderId(orderId);
            orderDetail.setNumber(item.getNumber());
            orderDetail.setDishFlavor(item.getDishFlavor());
            orderDetail.setDishId(item.getDishId());
            orderDetail.setSetmealId(item.getSetmealId());
            orderDetail.setName(item.getName());
            orderDetail.setImage(item.getImage());
            orderDetail.setAmount(item.getAmount());
            //addAndGet 讲bigdecimal 赋值给amount
            //intValue  将相乘后的 BigDecimal 值转换为整数
            amount.addAndGet(item.getAmount().multiply(new BigDecimal(item.getNumber())).intValue());
            return orderDetail;
        }).collect(Collectors.toList());


        orders.setId(orderId);
        orders.setOrderTime(LocalDateTime.now());
        orders.setCheckoutTime(LocalDateTime.now());
        orders.setStatus(2);
        orders.setAmount(new BigDecimal(amount.get()));//总金额
        orders.setUserId(userId);
        orders.setNumber(String.valueOf(orderId));
        orders.setUserName(user.getName());
        orders.setConsignee(addressBook.getConsignee());
        orders.setPhone(addressBook.getPhone());
        orders.setAddress((addressBook.getProvinceName() == null ? "" : addressBook.getProvinceName())
                + (addressBook.getCityName() == null ? "" : addressBook.getCityName())
                + (addressBook.getDistrictName() == null ? "" : addressBook.getDistrictName())
                + (addressBook.getDetail() == null ? "" : addressBook.getDetail()));

        //向订单表插入数据，一条数据
        this.save(orders);

        //向订单明细表插入数据，多条数据
        orderDetailService.saveBatch(orderDetails);

        //清空购物车数据
        shoppingCartService.remove(wrapper);
    }

    @Override
    public Page<OrdersDto> page(int page, int pageSize, String number, Date beginTime, Date endTime)  {
        //分页构造器
        Page<Orders> pageInfo = new Page<>(page,pageSize);
        Page<OrdersDto> dtoPage = new Page<>();
        //查询条件
        //SELECT *  FROM orders WHERE order_id like 12345 AND order_time BETWEEN '2023-01-01 00:00:00' AND '2023-01-31 23:59:59';
        LambdaQueryWrapper<Orders> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.like(number != null,Orders::getNumber,number);
        queryWrapper.between(beginTime != null && endTime != null,Orders::getOrderTime,beginTime,endTime);
        queryWrapper.orderByDesc(Orders::getOrderTime);
        //查询
        pageInfo = this.page(pageInfo,queryWrapper);
        //对象拷贝
        BeanUtils.copyProperties(pageInfo,dtoPage,"records");
        //手动set  OrderDetail的数据
        //创建dto的records数据集
        List<OrdersDto> list = new ArrayList<>();
        List<Orders> records = pageInfo.getRecords();
        for (Orders item: records) {
            OrdersDto ordersDto = new OrdersDto();
            BeanUtils.copyProperties(item,ordersDto);
            Long userId = item.getUserId();
            Long addressBookId = item.getAddressBookId();

            User user = userService.getById(userId);
            AddressBook addressBook = addressBookService.getById(addressBookId);
            //分别设置订单用户详细，地址信息
            if(user != null && addressBook != null){
                ordersDto.setUserName(user.getName());
                ordersDto.setPhone(user.getPhone());
                ordersDto.setAddress(addressBook.getDetail());
                ordersDto.setConsignee(addressBook.getConsignee());
                list.add(ordersDto);
            }
        }
        dtoPage.setRecords(list);
        return dtoPage;
    }

    @Override
    public Page<OrdersDto> userPage(HttpSession session,int page, int pageSize) {
        Long userId = (Long)session.getAttribute("user");

        Page<Orders> pageInfo = new Page(page,pageSize);
        Page<OrdersDto> dtoPage = new Page<>();
        LambdaQueryWrapper<Orders> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(Orders::getUserId,userId);
        this.page(pageInfo,queryWrapper);

        BeanUtils.copyProperties(pageInfo,dtoPage,"records");

        List<OrdersDto> list = new ArrayList<>();
        List<Orders> records = pageInfo.getRecords();
        for (Orders item: records) {
            OrdersDto ordersDto = new OrdersDto();
            BeanUtils.copyProperties(item,ordersDto);

            LambdaQueryWrapper<OrderDetail> wrapper = new LambdaQueryWrapper<>();
            wrapper.eq(OrderDetail::getOrderId,item.getId());
            List<OrderDetail> orderDetail = orderDetailService.list(wrapper);

            //分别设置订单用户名，订单数量
            if(orderDetail != null ){
               ordersDto.setOrderDetails(orderDetail);
                list.add(ordersDto);
            }
        }
        dtoPage.setRecords(list);
        return dtoPage;
    }
}